Strain enhancement in Bi1/2(Na0.82K0.18)1/2TiO3 lead-free electromechanical ceramics by co-doping with Li and Ta

Nguyen, Van-Quyet; Han, Hongliang; Kim, Kyung-Jong; Dang, Duc-Dung; Ahn, Kyoung Kwan; Lee, Jae‐Shin

doi:10.1016/j.jallcom.2011.09.043

Cited by 122 publications

(43 citation statements)

References 40 publications

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“…The trend is consistent with the previous results as shown in the BNT-BKT system with other chemical modifiers. 9,20,25 Electric field-induced polarization and strain hysteresis loops of the BNKTxSn ceramics are presented in Figs. 2(a) and 2(b), respectively.…”

Section: Resultsmentioning

confidence: 99%

Incipient piezoelectrics and electrostriction behavior in Sn-doped Bi1/2(Na0.82K0.18)1/2TiO3 lead-free ceramics

Han¹,

Jo²,

Kang³

et al. 2013

Journal of Applied Physics

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161

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Articles you may be interested inElectric-field-temperature phase diagram of the ferroelectric relaxor system (1−x)Bi1/2Na1/2TiO3−xBaTiO3 doped with manganese J. Appl. Phys. 115, 194104 (2014) Relaxorlike dielectric properties and history-dependent effects in the lead-free K 0.5 Na 0. Dielectric, ferroelectric, piezoelectric, and strain properties of lead-free Sn-doped Bi 1/2 (Na 0.82 K 0.18 ) 1/2 TiO 3 (BNKT) were investigated. A crossover from a nonergodic relaxor to an ergodic relaxor state at room temperature, accompanied by a giant electric-field-induced strain, was observed at 5 at. % Sn doping. Switching dynamics monitored during a bipolar poling cycle manifested that the observed giant strain originates from incipient piezoelectricity. When Sn doping level reached 8 at. %, BNKT exhibited an electrostrictive behavior with a highly temperature-insensitive electrostrictive coefficient of Q 11 ¼ 0.023 m 4 C À2 . V C 2013 AIP Publishing LLC [http://dx;

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Section: Resultsmentioning

confidence: 99%

Incipient piezoelectrics and electrostriction behavior in Sn-doped Bi1/2(Na0.82K0.18)1/2TiO3 lead-free ceramics

Han¹,

Jo²,

Kang³

et al. 2013

Journal of Applied Physics

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161

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“…A commercial soft PZT ceramic (PIC 151) exhibits achievable unipolar strain of 0.25% at 5kV/mm, S max /E max of 500 pmV, and hysteresis of 6 -7%. 7 The S max /E max of NBT-6BT-2KNN 7 and (Li, Ta)-doped BNKT 20 ceramics is higher than that of soft PZT, but these ceramics are inappropriate for practical actuator applications because of their extremely large hysteresis 15 The maximum strain value of 950 pm/V is about twice that of the commercial PZT ceramic (PIC 151) and can meet the requirement of high stroke actuator applications. In addition, the fabricated NBT-6BT-5KNN single crystal exhibits a low ∆S/S max of 12%.…”

Section: Resultsmentioning

confidence: 99%

Solid-state conversion of (94-x)(Na1/2Bi1/2)TiO3-6BaTiO3-x(K1/2Na1/2)NbO3 single crystals and their enhanced converse piezoelectric properties

Park

Kang

2016

AIP Advances

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(94-x)(Na1/2Bi1/2)TiO3-6BaTiO3-x(K1/2Na1/2)NbO3 (NBT-6BT-xKNN) piezoelectric ceramics have notable potential for replacing lead containing piezoelectric ceramics in actuator applications due to their exceptionally large strain. However, a high electric field for producing a large strain and a large hysteresis are critical issues that should be resolved for practical actuator applications. In an attempt to address these issues and optimize the piezoelectric performance, we fabricated NBT-6BT-xKNN (x = 0 - 5) piezoelectric single crystals with a size of 8 x 8x 10 mm by the solid-state single crystal growth method and systematically measured their electrical properties. With increased addition of KNN to replace NBT, the ferroelectricity and piezoelectricity of the fabricated [001] NBT-6BT-xKNN single crystals decreased, but their unipolar strain and hysteresis were considerably improved. For NBT-6BT-5KNN single crystals, the largest maximum strain (Smax) was 0.57% at 6 kV/mm, showing a converse piezoelectric constant (Smax/Emax) of 950 pm/V, and their hysteresis in the unipolar S-E curve was 12% at 6kV/mm, which would be appropriate for some actuator applications. Our results demonstrate the applicability of the produced single crystals as lead-free piezoelectric actuator components.

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“…The term incipient denotes "beginning to happen or develop". This indicates that at zero bias-field these materials depict an ergodic relaxor state with negligible 33 , whereas under electric field they develop a ferroelectric state and a reversible induced giant strain [121][122][123][124][125][126][127][128][129][130][131][132][133][134][135][136][137][138][139] and 33 values 121 , as schematically introduced in Figure 2.14. Research on these materials has focused on understanding their strain mechanism in order to further enhance it.…”

Section: Lead-free Relaxor Ferroelectricsmentioning

confidence: 99%

“…Since then, several binary and ternary BNT-based incipient piezoelectrics were shown to present giant strains. [121][122][123][124][125][126][127][128][129][130][131][132][133][134][135][136][137][138][139]258,[275][276][277][278] The KNN-based family of materials is also widely considered as a potential candidate to replace PZT. 10,29,154,279 pm/V at 2 kV/mm.…”

Section: Literature Review: Piezoceramics For Actuator Applicationsmentioning

confidence: 99%

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Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Acosta

2016

Springer Theses

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Strain enhancement in Bi1/2(Na0.82K0.18)1/2TiO3 lead-free electromechanical ceramics by co-doping with Li and Ta

Cited by 122 publications

References 40 publications

Incipient piezoelectrics and electrostriction behavior in Sn-doped Bi1/2(Na0.82K0.18)1/2TiO3 lead-free ceramics

Incipient piezoelectrics and electrostriction behavior in Sn-doped Bi1/2(Na0.82K0.18)1/2TiO3 lead-free ceramics

Solid-state conversion of (94-x)(Na1/2Bi1/2)TiO3-6BaTiO3-x(K1/2Na1/2)NbO3 single crystals and their enhanced converse piezoelectric properties

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

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